<template>
  <div>
    <!-- 面包屑部分 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item :to="{ path: '/goods' }">商品列表</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable='false'>
      </el-alert>
      <!-- 步骤条 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- Tab标签页 -->
      <el-form :model="addForm" :rules="formRules" ref="formRef" label-position='top' label-width="100px">
        <el-tabs v-model="activeIndex" tab-position="left" style="margin-top: 30px" :before-leave='beforeTabLeave' @tab-click='TabClick'>
          <el-tab-pane label="基本信息" name="0">
            <el-form-item prop="goods_name" label="商品名称">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item prop="goods_price" label="商品价格">
              <el-input v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item prop="goods_weight" label="商品重量">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item prop="goods_number" label="商品数量">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="propsDefault" @change="cascaderChange" clearable>
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name='2'>
            <el-form-item :label="item.attr_name" v-for="item in onlyData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name='3'>
            <!-- action 表示图片要上传到的后台API地址 -->
            <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove"
              list-type="picture" :headers='headerObj' :on-success='handleSuccess'>
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="40%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data: function () {
    return {
      // 激活顺序指数
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [],
        // 商品详情描述
        goods_introduce: '',
        attrs: []
      },
      formRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类列表
      cateList: [],
      // 级联选择器配置
      propsDefault: {
        expandTrigger: 'hover',
        label: 'cat_name',
        children: 'children',
        value: 'cat_id'
      },
      manyData: [],
      onlyData: [],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片的绝对路径
      previewPath: '',
      previewVisible: false
    }
  },
  created: function () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    getCateList: async function () {
      const res = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        this.$message.warning('商品分类数据获取失败')
      }
      this.cateList = res.data
    },
    // 级联选择器改变， 触发
    cascaderChange: function () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
        return null
      }
    },
    // 监听Tabs标签
    beforeTabLeave: function (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.warning('请先选择商品分类')
        return false
      }
    },
    // Tab标签页被选中时， 触发
    TabClick: async function () {
      // 证明访问的参数是
      if (this.activeIndex === '1') {
        const res = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) {
          return this.$message.warning('获取动态参数列表失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyData = res.data
      } else if (this.activeIndex === '2') {
        const res = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) {
          return this.$message.warning('获取静态属性列表失败')
        }
        // res.data.forEach(item => {
        //   item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        // })
        this.onlyData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview: function (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove: function (file) {
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中，找到这个图片的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组的splice方法，吧图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1)
    },
    // 监听图片上传成功的事件
    handleSuccess: function (response) {
      // 1.拼接得到一个图片信息对象
      const picInfo = {
        pic: response.data.tmp_path
      }
      // 2.讲图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
    },
    // 添加商品
    add: function () {
      this.$refs.formRef.validate(async valid => {
        if (!valid) {
          return this.$message.warning('请完善所有表单项')
        }
        // 执行添加业务逻辑
        // lodash  cloneDeep()
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // 发起请求，添加商品
        const res = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          this.$message.warning('商品添加失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId: function () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>
<style lang="less" scoped>
.el-tab-pane {
  margin-left: 20px;
}
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.el-button {
  margin-top: 20px;
}
</style>
